OIL RECOVERY FROM LENTICULAR RESERVOIRS

Abstract

The coefficient of oil recovery (COR) average in our country shows a steady decreasing tendency in recent years. One of the reasons is deterioration of the resource base structure due to increase in the share of hardly recoverable oil reserves in the oil fields put into operation. Many newly discovered fields are initially characterized as hardly recoverable oil reserves. Oil pools with lenticular reservoirs make up a fairly large share in hardly recoverable reserves. Such pools are found in all oil-producing regions. A low degree of oil recovery in lenticular reservoirs is a generally recognized fact. For instance, the COR value is estimated at 10% for lenticular reservoirs in the technical–economic assessment of COR in the Arkutun–Dagin oil field (Project Sakhalin-1). It is evident that we can hardly agree with such a low efficiency of oil reserve development.